JP6636588B2 - Magnetic dynamic braking assembly - Google Patents

Description

  The present invention relates generally to dampers. In particular, the present invention relates to an assembly for magnetic dynamic damping useful for isolating vibrational forces.

  Conventional damping assemblies are used to isolate vibratory forces and are particularly useful in motor vehicles that are subject to numerous vibration loads. Damping assemblies are often used between the engine and the chassis of an automobile to isolate both environmental vibrations, such as running on bumpy roads, and internal vibrations, such as idling the engine. These assemblies include a chamber that provides rebound when under elevated pressure. Many damping assemblies include a partition that includes a decoupler having an elastic diaphragm that opaquely divides the chamber into sub-chambers. If one of the sub-chambers experiences an elevated pressure, the diaphragm will flex into the other sub-chamber and passively diminish the oscillating force. The diaphragm is then particularly useful for isolating the second type of vibration, engine idling. The current trend is to incorporate elements to switch the decoupler between active and inactive states for situations where passive damping is not required. One example is described in U.S. Pat. No. 5,246,212 to Funahashi et al., Where a damper is utilized in an automobile and a split chamber that pulls a diaphragm so that vibration cannot be passively damped. A vacuum source for reducing pressure until one side of the is bent. Another example described in U.S. Patent No. 9,022,368 relates to applying electricity through a ferromagnetic diaphragm that switches the diaphragm between a raised state and a flexible state. However, a general disadvantage of these conventional damping units is that the damping force requirements of the decoupler can only be adjusted between more than the active state and the inactive state. In particular, in situations where damping is required but the amplitude and frequency of the vibrations are changing to a lesser or greater degree, the prior art has failed to provide a satisfactory dynamic decoupler. .

The present invention provides a magnetic dynamic braking assembly useful for isolating vibration forces. The assembly includes a housing wall bounding a main chamber having a fixed magnetic source disposed therein. A diaphragm made of a resilient material is placed in an assembly that divides the main chamber into sub-chambers impermeablely. The diaphragm includes at least one magnetic actuation element near the fixed magnetic source. A source of current energizes the magnetically actuated element, the fixed magnetic source, or both, and pulls or pulls the magnetically actuated element relative to the fixed magnetic source. The magnetic guide surrounds the fixed magnetic source and forms a gap exposing the fixed magnetic source to the magnetic actuation element. The magnetic guide routes the magnetic field toward the gap and prevents outward electromagnetic interference to other parts of the assembly. The partition includes a magnetic guide surrounding the fixed magnetic source, forming a gap exposing the fixed magnetic source to the magnetic actuation element, and guiding a magnetic field toward the gap. The at least one magnetic actuating element extends axially from the diaphragm to form a surface rib extending toward the gap, the surface rib having a contour that enters the gap when energized. The diaphragm further includes a non-magnetic insert disposed therein, spaced apart above the at least one magnetic actuation element to provide radial and axial support, and aligning the surface rib with the gap. The non-magnetic insert includes a stepped surface having an inwardly-spaced thinned portion and an outwardly-spaced widened portion, wherein at least one magnetic actuating element is disposed on the thinned portion, wherein the widened portion has at least Some routes of electromagnetic interference directed laterally and axially outward from the gap back into the gap.

  The assembly increases tuning within the damping assembly while preventing electromagnetic interference in certain applications. In environments where variable damping is desired, the present invention provides variable flexibility and movement of the diaphragm, depending on the amplitude or frequency of the vibration. The movement of the diaphragm depends on the strength of the magnetic field to which the diaphragm is exposed. Further, in applications where there is no need for electromagnetic interference, such as a magnetorheological fluid damper, the magnetic guide routes the magnetic field directly to the diaphragm, preventing exposure of the magnetic working fluid to the magnetic field.

Other advantages of the present invention will be better understood and readily understood by referring to the following detailed description when considered in connection with the accompanying drawings.
It is sectional drawing of an example of embodiment of the attenuation unit in the non-energized state in which a diaphragm bends freely. It is a sectional view of an example of an embodiment of an attenuation unit in an energized state where movement of a diaphragm is controlled by magnetic force. FIG. 3 is a cross-sectional view of one embodiment of the present invention utilizing a moving coil and a fixed permanent magnet. FIG. 5 is a cross-sectional view of another embodiment of the present invention utilizing a movable coil and a fixed induction coil. FIG. 11 is a cross-sectional view of yet another embodiment of the present invention utilizing an annular movable magnet and a fixed induction coil. FIG. 11 is a cross-sectional view of another embodiment of the present invention using a plurality of block-shaped movable magnets and fixed induction coils. It is an expanded sectional view explaining connection of a decoupler to a damping unit. 3B is a graphical representation of the embodiment shown in FIG. 3A utilizing a fixed permanent magnet and a moving coil. 3B is a graphical representation of the embodiment shown in FIG. 3A utilizing a fixed permanent magnet and a moving coil. 3B is a graphical representation of the embodiment shown in FIG. 3A utilizing a fixed permanent magnet and a moving coil. FIG. 3B is a graphical representation of the embodiment shown in FIG. 3B utilizing a fixed induction coil with a moving coil. FIG. 3B is a graphical representation of the embodiment shown in FIG. 3B utilizing a fixed induction coil with a moving coil. FIG. 3B is a graphical representation of the embodiment shown in FIG. 3B utilizing a fixed induction coil with a moving coil. FIG. 3C is a graphical representation of the embodiment shown in FIG. 3C utilizing a fixed induction coil with a single annular moving magnet. FIG. 3C is a graphical representation of the embodiment shown in FIG. 3C utilizing a fixed induction coil with a single annular moving magnet. FIG. 3C is a graphical representation of the embodiment shown in FIG. 3C utilizing a fixed induction coil with a single annular moving magnet. FIG. 3D is a graphical representation of the embodiment shown in FIG. 3D utilizing a fixed induction coil with a plurality of block-like movable magnets. FIG. 3D is a graphical representation of the embodiment shown in FIG. 3D utilizing a fixed induction coil with a plurality of block-like movable magnets. FIG. 3D is a graphical representation of the embodiment shown in FIG. 3D utilizing a fixed induction coil with a plurality of block-like movable magnets.

  Exemplary embodiments are described more fully with reference to the accompanying drawings. This embodiment is directed to a magnetic dynamic braking assembly. However, the exemplary embodiments are provided solely for completeness of the disclosure, and will fully convey the scope to those skilled in the art. In order to provide a thorough understanding of embodiments of the present disclosure, numerous specific details are set forth as example elements. Referring to the drawings, a magnetic dynamic braking assembly constructed in accordance with the present invention is shown generally in FIGS. Note that the same reference numerals indicate corresponding parts throughout the drawings.

  The magnetic dynamic braking assembly includes a damping unit 20 shown generally in FIGS. The damping unit 20 has a cylindrical housing wall 22 extending around the axis A between a base 24 and an upper part 26, which bounds a main chamber 28 therein. Barrier 30 is spaced between base portion 24 and upper portion 26 and divides main chamber 28 between base sub-chamber 32 and upper sub-chamber 34. The barrier 30 generally extends centrally between the base 24 and the top 26 perpendicular to the axis A. Partition 36 is disposed within main chamber 28 and includes an internal retaining wall 38. The inner retaining wall 38 includes a first portion 40, a second portion 42, a third portion 44, and a fourth portion 46 that extend radially about the axis A and are divided by a step, with each subsequent The portion extends radially outward from the preceding portion at the step. The first portion 40 forms an isolation chamber 48 having a generally cylindrical shape. The second portion 42 extends radially outward from the first portion 40 to form a bottom bearing holding space. Next, the third portion 44 extends radially outward from the second portion 42 to form a decoupler holding space. In the next step, the fourth portion 46 extends radially outward from the third portion 44 to form an upper bearing holding space. The bottom bearing ring 52 includes a bottom bearing rib 54 and is located on a step between the first portion 40 and the second portion 42 and is pressed into the second portion 42. The decoupler 50 is located on the next step and is pushed into the third portion 44 to impermeablely isolate the isolation chamber 48 from the main chamber 28. The upper bearing ring 56 includes an upper bearing rib 58 and is located on the last step and is pressed into the fourth portion 46.

  The decoupler 50 shown generally in FIGS. 1-4 has a disk shape. Decoupler 50 includes an annular outer ring 60 that defines a flexible diaphragm 62. The outer ring 60 supports the diaphragm 62 both axially and radially and extends axially between the top ring side and the bottom ring side. The outermost end of the outer ring 60 can be sized to engage the third portion 44 of the inner retaining wall 38 in a press-fit connection. The outer ring 60 has a cross section that forms a circular outer portion 64 that extends inward toward a neck 66 that extends inward toward the retaining portion 68. The holding section 68 is connected to the diaphragm 62 and holds the diaphragm 62. Since the outer ring 60 is thicker than the diaphragm 62, the diaphragm 62 is disposed between the upper ring side and the bottom ring side, and is separated from the upper ring side and the bottom ring side. When assembled, the neck 66 includes a bottom bearing rib 54 and a top bearing rib 54 to retain the circular outer portion 64 within the third portion 44 while allowing some axial bending of the outer ring 60. 58 and adjacently disposed. Thus, when the main chamber 28 is placed under pressure, the assembly allows for elastic displacement of the diaphragm 62 in a direction toward or away from the isolation chamber 48.

  As best illustrated in FIGS. 3A-4, to provide the decoupler 50 with dynamic rebound, the partition 36 includes a fixed magnetic source 70 that is utilized to use a magnetic field when energized. . The fixed magnetic source 70 includes an outer side facing the housing wall 22 of the attenuation unit 20 and an inner side facing the isolation chamber 48. The decoupler 50 includes a magnetic actuation element 72 embedded therein and extending axially therefrom to form a diaphragm rib 74. Magnetic guide 76 extends around fixed magnetic source 70 to hold a magnetic field. The magnetic guide 76 includes a sleeve 78 located outside the fixed magnetic source 70 and a core 80 located inside the fixed magnetic source 70. The sleeve 78 and the core 80 are arranged such that the entire fixed magnetic source 70 is surrounded except for a small gap 82 between the sleeve 78 and the core 80 facing the diaphragm rib 74 of the decoupler 50. In one embodiment, sleeve 78 includes an annular sleeve wall 84. The sleeve wall 84 extends vertically to a sleeve lip 86 that extends radially inward from the sleeve wall 84. The core 80 includes an annular core wall 87. The core wall 87 extends to a core lip 88 that extends radially outward therefrom. Sleeve 78 and core 80 guide the magnetic field into gap 82 and direct it with decoupler 50 to prevent electromagnetic interference outside of partition 36. The magnetic actuation element 72 responds to the magnetic field used, wherein an axially extending diaphragm rib 74 is drawn into or out of the gap 82. A non-magnetic insert 90 (shown in FIG. 4) is placed on the magnetic actuating element 72 and supports it radially and axially to align the magnetic actuating element 72 during the push-pull movement. The insert 90 is non-magnetic, does not interfere with the magnetic operation of the partition 36, and can reverse the route of the magnetic field toward the gap 82.

  In one embodiment, shown in FIG. 3A, magnetic actuation element 72 includes a moving coil 72 a embedded in diaphragm 62. The movable coil 72a extends annularly around the center of the diaphragm 62 to form an annular rib 74 projecting in the axial direction. The movable coil 72a has a non-energized state and an energized state, and is connected to a current supply source 94 to switch between these states. In a preferred embodiment, the moving coil 72a is overmolded into the diaphragm 62 and includes approximately 200 turns. This embodiment also utilizes an annular non-magnetic insert 90 (shown in FIG. 4) embedded in diaphragm 62. The non-magnetic insert 90 includes a thin portion 96 and a wide portion 98 divided by an axial step. The non-magnetic insert 90 supports the moving coil 72a without being affected by the magnetic field. The movable coil 72a is disposed directly below the thin portion 96 and is adjacent to the step. The stationary magnetic source 70 includes at least one permanent magnet 70a located along the first portion 40 of the inner retaining wall 38 between the core 80 and the sleeve 78. In the preferred embodiment, the at least one permanent magnet 70a includes one ring-shaped magnet, but a plurality of magnets may be used. Permanent magnet 70a generates a magnetic field that is guided into gap 82 by core 80 and sleeve 78. When the movable coil 72a is energized, a current that draws or repels the movable coil 72a with respect to the gap 82 is formed depending on the direction of the current flowing into the movable coil 72a. In operation, the non-magnetic insert 90 remains unaffected by the magnetic field, keeping the moving coil 72a aligned with the gap 82, re-routing the magnetic field, and preventing electromagnetic interference outside the magnetic guide 76. The graphical representation of FIG. 5A shows the rerouting of the magnetic field by the magnetic guide 76 and includes a legend showing the strength of the magnetic field along the area of the magnetic guide 76 and the gap 78. 5B and 5C are graphical representations of the position of the moving coil 72a, where the position of the moving coil 72a depends on the strength of the induced magnetic field as a function of the amount of current supplied.

  In another embodiment, shown in FIG. 3B, the magnetic actuation element 72 further includes a moving coil 72a and a non-magnetic insert 90 embedded in the diaphragm 62 as described above. However, the fixed magnetic source 70 includes a fixed induction coil 70b located along the first portion 40 of the inner retaining wall 38 between the core 80 and the sleeve 78. The fixed induction coil 70b is wound around the bobbin 100 several times and is electrically connected to a current supply source 94. In one preferred embodiment, fixed induction coil 70b has more turns than moving coil 72a. In one exemplary embodiment, fixed induction coil 70b has approximately 410 turns. The current fluctuation in the induction coil 70b and the movable coil 72a draws and repels the movable coil 72a from the gap 82 depending on the direction of the current passing through the induction coil 70b and the movable coil 72a. If a fixed induction coil 70b is used, the magnetic guide 76 allows a wire to extend therethrough and allows an electrical connection between the fixed induction coil 70b and the current source 94 to be formed. One or more openings may be formed. The graphical representation in FIG. 6A shows the rerouting of the magnetic field by the magnetic guide 76 and includes a legend showing the strength of the magnetic field along the area of the magnetic guide 76 and the gap 78. 6B and 6C are graphical representations of the position of the moving coil 72a, the position of the moving coil 72a being dependent on the strength of the induced magnetic field as a function of the amount of current supplied to both the moving coil 72a and the fixed induction coil 72b. Dependent.

  In yet another embodiment, shown in FIG. 3C, the magnetic actuation element 72 includes at least one movable magnet 72b. The at least one movable magnet 72b includes one annular magnet generally corresponding to the shape of the gap 82 between the sleeve 78 and the core 80. The movable magnet 72b always supplies a magnetic field. Since this magnetic field is always present, the fixed magnetic source 70 in this embodiment is a fixed induction coil 70b so that there are always no two interacting magnetic fields. Thus, when current is applied to the fixed induction coil 70b, the fixed induction coil 70b generates a magnetic field and pulls the movable magnet into the gap 82 or pushes the movable magnet away from the gap 82. The graphical representation in FIG. 7A shows the rerouting of the magnetic field by the magnetic guide 76 when one annular movable magnet 72b is used, and includes a legend showing the strength of the magnetic field along the area of the magnetic guide 76 and the gap 78. . 7B and 7C are graphical representations of the location of the annular movable magnet 72b, which depends on the strength of the magnetic field as a function of the amount of current supplied to the fixed induction coil 72b.

  In another embodiment shown in FIG. 3D, the magnetic actuation element 72 includes a plurality of block magnets 72c. The block magnet 72c is arranged on the diaphragm 62 in an annular shape corresponding to the gap 82 between the sleeve 78 and the core 80. As in the previous embodiment, the block magnet 72c always supplies a magnetic field. Since this magnetic field is always present, the fixed magnetic source 70 in this embodiment is a fixed induction coil 70b so that there are no two interacting magnetic fields at all times. Therefore, when the fixed induction coil 70b is energized, the fixed induction coil 70b generates a magnetic field and pulls the block magnet 72c into the gap 82 or pushes the block magnet 72c away from the gap 82. The graphical representation in FIG. 8A shows the rerouting of the magnetic field by the magnetic guide 76 when using the block magnet 72c and includes a legend showing the strength of the magnetic field along the area of the magnetic guide 76 and the gap 78. 8B and 8C are graphical representations of the location of the block magnet 72c, which depends on the strength of the magnetic field as a function of the amount of current supplied to the fixed induction coil 70b.

  The damping unit 20 in the preferred embodiment includes a magnetic fluid (MR fluid). The barrier 30 of the damping unit 20 using the MR fluid generally forms a flow path 102 extending between the upper sub-chamber 34 and the base sub-chamber 32. When an applied pressure is applied to one of the sub-chambers 32, 34 by an oscillating force, the MR fluid is squeezed from the pressurized sub-chamber to a less pressurized sub-chamber. A solenoid 104 is positioned adjacent the flow path 102 to adjust the magnitude of the pressure that moves the MR fluid between the sub-chambers 32 and 34 and the speed at which the MR fluid flows. When a current is supplied to the solenoid 104, a magnetic field extending around the flow path 102 is formed. When the MR fluid is exposed to a magnetic field, the magnetic particles in the MR fluid align to increase viscosity, thereby increasing resistance to squeezing through the flow path 102. As such, the particular rebound characteristics of the MR damper may vary with the amount of current supplied through the solenoid 104.

  In addition to guiding the magnetic field of the fixed magnetic source 70, the magnetic sleeve 78 and the core 80 also relocate and localize the magnetic field away from the flow path 102 to prevent flow path interference. According to this functionality, the magnetic field generated by solenoid 104 is the only magnetic field that interacts with the MR fluid. Stated another way, pushing and pulling the decoupler 50 does not affect the viscosity around the flow path 102, and the solenoid 104 does not affect the pushing and pulling of the decoupler 50.

  During operation, the current supply 94 can supply current to either end of the wound fixed induction coil 70b or the moving coil 72a. As a result, the poles of the generated magnetic field can be reversed and pushed instead of pulled. Further, the current can be increased or decreased as needed. Since no current is supplied at one end of the increase or decrease, the diaphragm 62 bends without limitation. On the other side of the scaling, the maximum current is supplied to the fixed induction coil 70b, the moving coil, or both. When the maximum current is supplied, a strong magnetic field is generated, the ribs 92 of the diaphragm 62 are completely drawn into the gap 82, and the vibration, that is, the damping of the diaphragm 62 is suppressed. In the middle of the increase or decrease, a moderate amount of current can be supplied which somewhat limits the movement of the ribs 92 with respect to the gap 82, but still allows the diaphragm 62 to retain some flexibility. The current source 94 is electrically connected to a controller, such as a CPU 106, that is programmed to recognize the threshold frequency or amplitude of the oscillation and provide sufficient current to obtain optimal damping from the decoupler 50. be able to. The threshold value recognized by the CPU 106 may be a speed of a pressure change in one or more of the sub-chambers 32 and 34. Thereafter, the CPU 106 sends a signal to the current supply 94 to supply a certain amount of current in a particular direction within the moving coil 72a and the fixed induction coil 70b, and ultimately a smoother ride for both the driver and the passenger. Can be provided.

  It should be understood that in the embodiments described herein, the divider 36 is integral with the barrier 30 and extends along the axis A. However, the partition 36 may be offset from the axis A and may form an isolation chamber 48 anywhere in the damping unit 20. The isolation chamber 48 may be open to the atmosphere or may be completely closed. Similarly, the oscillating force need not be along axis A, and eventually decoupler 50 responds to the changing pressure of any chamber it divides. Further, it should be understood that magnetic guide 76 and non-magnetic insert 90 may include any number of suitable materials. For example, these elements can include a material having a high magnetic permeability that alters the magnetic field, specifically the route of the magnetic flux. By way of non-limiting example only, these materials may include cobalt iron, permalloy, and many other suitable materials, ideally combining high permeability and low weight.

  Obviously, many modifications and variations of the present invention are possible in light of the above teachings and may be practiced otherwise than as specifically described as long as it falls within the scope of the appended claims. The foregoing citation should be construed as covering all combinations in which the novelty of the present invention exercises its utility. The use of the word "said" in a device claim refers to an antecedent that is a positive citation intended to be included in the scope of the claim, or is intended to be included in the scope of the claim. Precede words that do not. Also, reference signs in the claims are for convenience only and should not be construed as limiting in any way.

Claims (11)

A magnetic dynamic braking assembly,
A damping unit comprising a housing wall extending between the base portion and the upper portion and bounding the main chamber therein;
A partition disposed in the damping unit and including a diaphragm made of an elastic material that opaquely divides the main chamber into a plurality of sub-chambers;
A current source;
With
The diaphragm includes at least one magnetic actuation element,
The partition further includes a fixed magnetic source for generating a magnetic field near the at least one magnetic actuation element,
The current source is configured to supply current to the partition such that a magnetic field is generated that adjusts the at least one magnetic actuating element of the diaphragm relative to the fixed magnetic source; If the source of the current does not supply a current to bend by pressure change in one of the sub-chamber without the diaphragm is restricted, and a non-energized state seen including,
The partition includes a magnetic guide surrounding the fixed magnetic source, forming a gap exposing the fixed magnetic source to the magnetic actuating element, and guiding the magnetic field toward the gap.
The at least one magnetic actuating element extends axially from the diaphragm to form a surface rib extending toward the gap, the surface rib having a contour that enters the gap in the energized state;
A non-magnetic insert disposed therein, spaced apart above the at least one magnetic actuation element to provide radial and axial support, aligning the surface ribs with the gap; Further comprising
The non-magnetic insert includes a stepped surface having an inwardly-spaced thinned portion and an outwardly-spaced widened portion, wherein the at least one magnetic actuating element is disposed on the thinned portion and includes the widened portion. The portion returns at least a portion of the lateral and axially outward electromagnetic interference routes from the gap into the gap.
Magnetic dynamic braking assembly. The fixed magnetic source includes a fixed induction coil, and the current source is electrically connected to the fixed induction coil to supply current and generate the magnetic field;
Wherein the at least one magnetic actuation element includes a movable magnet.
Or
The at least one magnetic actuating element includes a moving coil, the current source is also electrically connected to the moving coil, and supplies current independently to the moving coil and the fixed induction coil. Produce a working magnetic field,
The magnetic dynamic braking assembly according to claim 1 . The fixed magnetic source includes a fixed permanent magnet that generates the magnetic field, the at least one magnetic actuating element includes a moving coil, and the moving coil is electrically connected to the current source that operates the moving coil. And interacts with the magnetic field generated by the fixed permanent magnet,
The magnetic dynamic braking assembly according to claim 1 . The damping unit comprises:
Including a magnetic fluid,
A flow path, which changes the viscosity of the magnetic fluid flowing into the flow path, having a solenoid adjacent to the flow path,
Magnetic dynamic braking assembly according to any one of claims 1 to 3. The magnetic dynamic braking assembly comprises a decoupler including a diaphragm made of an elastic material ;
Before SL stationary magnetic source is configured to generate a magnetic field, the attracted at least one magnetic actuation element, is repelled,
Before Symbol magnetic guide is to prevent the magnetic field is changed toward the root of the magnetic field in the gap,
The magnetic dynamic braking assembly according to claim 1. The at least one magnetic actuation element has an annular shape, and the gap has a corresponding annular shape profile to allow entry of the at least one magnetic actuation element;
The magnetic dynamic braking assembly according to claim 5 . The non-magnetic insert is annular in shape,
The magnetic dynamic braking assembly according to claim 6 . The decoupler is stiffer than the diaphragm and includes an outer ring portion that delimits the diaphragm and provides axial and radial support to the diaphragm.
A magnetic dynamic braking assembly according to any one of claims 5 to 7 . The damping unit includes a top bearing ring and a bottom bearing ring, the outer ring portion of the decoupler is sandwiched between the top bearing ring and the bottom bearing ring, and the outer ring portion has a circular outer portion. , Having a cross-section forming an intermediate neck portion and an internal retainer, each of the bearing rings to allow some axial bending of the neck portion while retaining the circular outer portion. A bearing rib extending oppositely toward the neck of the outer ring.
The magnetic dynamic braking assembly according to claim 8 . The magnetic guide includes a sleeve and a core pressed together, the sleeve including an annular sleeve wall that extends radially inward from the annular sleeve wall to a sleeve lip. Extending, the core includes an annular core wall, the annular core wall extending from the annular core wall to a core lip extending radially outwardly.
A magnetic dynamic braking assembly according to any one of claims 5 to 9 . Before SL damping unit includes a magneto-rheological fluid has a flow path, to change the viscosity of the magneto-rheological fluid entering said flow path, and a solenoid adjacent to the flow channel,
Magnetic dynamic braking assembly according to any one of claims 1 to 5 0.